Fuel Cells

Cards (9)

What are fuel cells supplied by?
External source of fuel (like hydrogen) and oxygen or air
How is potential difference produced in a fuel cell?
Fuel is oxidised electrochemically within the fuel cell
Overall reaction in a hydrogen fuel cell
Involves the oxidation of hydrogen to produce water
What do hydrogen fuel cells offer?
A potential alternative to batteries and rechargeable cells
What is the cathode in a fuel cell?
Positive electrode
What is the anode in a fuel cell?
Negative electrode
Reduction at cathode and oxidation at anode
At negative electrode so the anode
2H2 → 4H+ + 4e-(oxidation)
At positive electrode so the cathode
02 + 2H20 + 4e → 40H-(reduction)